The justices were unable to produce a majority decision. Four justices voted to affirm. Four justices voted to vacate, to strike down the Corps's interpretation of the CWA, and to remand under a new "continuous surface water connection" standard. Justice Kennedy also voted to vacate and remand but under the different, "significant nexus", standard. The Court voted 4-1-4, with three justices making oral readings at the opinion announcement, and five printed opinions spanning over 100 pages. Both cases were remanded "for further proceedings".
Justice Scalia's plurality opinion Justice Antonin Scalia authored a
plurality opinion, joined by
Chief Justice John Roberts, Justice
Clarence Thomas, and Justice
Samuel Alito. Scalia began his analysis by arguing that the Corps "exercises the discretion of an enlightened despot" and quoted factors it used when choosing to exercise jurisdiction, such as "aesthetics" and "in general, the needs and welfare of the people". He then criticized the cost associated with exercising jurisdiction, noting that the average applicant spends 788 days and $271,596 on an application and that "for backfilling his own wet fields", Rapanos faced 63 months in prison. Scalia argued the "immense expansion of federal regulation" over "swampy lands" would give the Corps jurisdiction over "half of Alaska and an area the size of California in the lower 48 States." Scalia detailed the Clean Water Act's history, from the litigation forcing the Corps to broaden its jurisdiction beyond traditional navigable waters to its adoption of the Migratory Bird Rule after
Riverside Bayview to
SWANCC's rejection of that rule and calls for new regulations. He then noted that the Corps has still not amended its published regulations, and emphasized a
Government Accountability Office investigation finding disparate standards across different Corps district offices. Scalia ultimately concluded that Waters of the United States should include only relatively permanent, standing or continuously flowing bodies of water because, according to him, that was the definition of "the waters" in Webster's Dictionary. He also rejected Justice Kennedy's assertion that the same dictionary definition lists floods as an alternative usage, on the grounds that it is "strange to suppose that Congress had waxed Shakespearean." Therefore, he suggested, the Corps's regulations of intermittent streams were "useful oxymora". According to the plurality opinion, the Clean Water Act confers federal jurisdiction over non-navigable waters only if the waters exhibit a relatively permanent flow, such as a river, lake, or stream. In addition, a wetland falls within the Corps's jurisdiction only if there is a continuous surface water connection between it and a relatively permanent waterbody, and it is difficult to determine where the waterbody ends and the wetland begins. In addition to his textualist arguments, Scalia also argued that his conclusions conformed with basic principles of federalism. Quoting the CWA's policy to "protect the primary responsibilities and rights of the States", he argued that the Corps's inferred jurisdiction failed the
clear statement rule. Furthermore, because its interpretation "stretches the outer limits of Congress's commerce power", Scalia justified his selective interpretation under
constitutional avoidance. He argued that a nexus exists where the wetland or waterbody, either by itself or in combination with other similar sites, significantly affects the physical, biological, and chemical integrity of the downstream navigable waterway. Kennedy spent the rest of his concurring opinion explaining why the eight other justices were wrong. He called Scalia's opinion "inconsistent with the Act's text, structure, and purpose" and wrote that what Scalia called "wet fields" were in fact sensitive habitats that provide essential
ecosystem services. He also criticized Scalia's selective reliance on only part of the dictionary definition of "waters". Kennedy noted that even the
Los Angeles River might fail Scalia's test. Kennedy also attacked, "as an empirical matter", Scalia's assertion that silt cannot wash downstream. Likewise, Kennedy criticized Stevens's dissenting opinion, writing, "while the plurality reads nonexistent requirements into the Act, the dissent reads a central requirement out." Referring to the inconsistencies found by the GAO investigation, Kennedy wrote that he could not share Stevens's trust in the Corps's reasonableness.
Justice Stevens's dissenting opinion Justice Stevens wrote a dissenting opinion, joined by Justice
David Souter, Justice
Ruth Bader Ginsburg, and Justice
Stephen Breyer. Stevens called the Corps's asserted jurisdiction "a quintessential example of the Executive's reasonable interpretation" and argued that
Riverside Bayview already "squarely controls" the validity of the regulations. After reviewing in detail the criminal allegations against Rapanos, Stevens emphasized that the
SWANCC Court limited Corps jurisdiction over only truly isolated waters, and Congress deliberately acquiesced to Corps regulation when it appropriated funds for the
National Wetlands Inventory. Stevens also criticized Scalia's "dramatic departure" from
Riverside Bayview in a "creative opinion" that "is utterly unpersuasive". He derided Scalia's new limit on jurisdiction to relatively permanent bodies of water as an "arbitrary distinction". Additionally, Stevens criticized Scalia for "cit[ing] a dictionary for a proposition it does not contain." Rather, Stevens argued that "common sense and common usage" treat intermittent streams as streams. Stevens concluded that "the very existence of words like 'alluvium' and 'silt' in our language" disprove Scalia's assertion that material does not normally wash downstream. Stevens noted that he agreed with Kennedy's description of the cases and Kennedy's critique of Scalia's opinion. But Stevens wrote that he was "skeptical" that there actually were any adjacent wetlands that would not meet Kennedy's significant nexus test. Nevertheless, Stevens clarified that because all four dissenters adopted the broadest jurisdictional test, they would also find Corps jurisdiction in any case that meets either Scalia's or Kennedy's test. Stevens therefore assumed Kennedy's "approach will be controlling in most cases".
Justice Breyer's dissenting opinion Justice Breyer wrote separately to note that he believed that Corps CWA authority extended to the very limits of the
interstate commerce power. Because he believed that agency expertise would produce better definitions than
judicial review, he called on the Corps to write new regulations "speedily." == Subsequent developments ==